| CPC E04D 13/076 (2013.01) [C02F 1/004 (2013.01); C02F 1/505 (2013.01); C02F 2103/001 (2013.01); C02F 2303/04 (2013.01)] | 20 Claims |

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15. A filtration device for filtering a fluid, comprising:
a barrier member having a plurality of openings through which the fluid can penetrate the barrier member, the barrier member having
first members that extend along a first direction, and
second members that extend along a second direction that is non-parallel to the first direction; and
an ion-dispersing member attached to the barrier member,
wherein the barrier member is a single-layer mesh comprising the first members and the second members,
a first portion of the ion-dispersing member is uncovered on a first side of the barrier member by any part of the barrier member,
a second portion of the ion-dispersing member is uncovered on the first side of the barrier member by any part of the barrier member,
the first portion has a length along the first side of the barrier member,
the second portion has a length along the first side of the barrier member, and
the length of the first portion and the length of the second portion are different lengths.
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